Finding the Third Proportional to 8,719.50 and 13,099

Step by Step Solution

1. Step 1: Write the proportion equation
   8,719.50 : 13,099 = 13,099 : x
2. Step 2: Convert to fraction form
   8,719.50/13,099 = 13,099/x
3. Step 3: Cross multiply
   8,719.50x = 13,099 × 13,099
4. Step 4: Simplify right side
   8,719.50x = 171,583,801
5. Step 5: Solve for x
   x = 171,583,801/8,719.50
6. Step 6: Final answer
   x = 19,678.17